OP90AZ/883 [ADI]
Precision Low-Voltage Micropower Operational Amplifier; 精密低电压，微功耗运算放大器
| 型号： | OP90AZ/883 |
| 厂家： | 
ADI |
| 描述： | Precision Low-Voltage Micropower Operational Amplifier |
| 文件： | 总12页 (文件大小：641K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Precision Low-Voltage Micropower
Operational Amplifier
a
OP90
FEATURES
PIN CONNECTIONS
Single/Dual Supply Operation: 1.6 V to 36 V,
؎0.8 V to ؎18 V
True Single-Supply Operation; Input and Output
Voltage Ranges Include Ground
Low Supply Current: 20 A Max
High Output Drive: 5 mA Min
Low Input Offset Voltage: 150 V Max
High Open-Loop Gain: 700 V/mV Min
Outstanding PSRR: 5.6 V/V Max
Standard 741 Pinout with Nulling to V–
8-Lead Hermetic DIP
(Z-Suffix)
8-Lead Epoxy Mini-DIP
(P-Suffix)
8-Lead SO
(S-Suffix)
1
2
3
4
8
7
6
5
NC
V
NULL
–IN
OS
V+
+IN
OUT
V–
V
NULL
OS
GENERAL DESCRIPTION
NC = NO CONNECT
The OP90 is a high performance, micropower op amp that
operates from a single supply of 1.6 V to 36 V or from dual
supplies of 0.8 V to 18 V. The input voltage range includes
the negative rail allowing the OP90 to accommodate input
signals down to ground in a single-supply operation. The OP90’s
output swing also includes a ground when operating from a
single-supply, enabling “zero-in, zero-out” operation.
external nulling. Gain exceeds 700,000 and common-mode
rejection is better than 100 dB. The power supply rejection
ratio of under 5.6 µV/V minimizes offset voltage changes experi-
enced in battery-powered systems.
The low offset voltage and high gain offered by the OP90 bring
precision performance to micropower applications. The minimal
voltage and current requirements of the OP90 suit it for battery
and solar powered applications, such as portable instruments,
remote sensors, and satellites.
The OP90 draws less than 20 µA of quiescent supply current,
while able to deliver over 5 mA of output current to a load. The
input offset voltage is below 150 µV eliminating the need for
V+
+IN
OUTPUT
–IN
*
*
NULL
NULL
V–
*ELECTRONICALLY ADJUSTED ON CHIP
FOR MINIMUM OFFSETVOLTAGE
Figure 1. Simplied Schematic
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
–SPECIFICATIONS
OP90
(VS = ؎1.5 V to ؎15 V, TA = 25؇C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
OP90A/E
OP90G
Typ Max Unit
Parameter
Symbol Conditions
Min
Typ
Max
150
3
Min
INPUT OFFSET VOLTAGE
INPUT OFFSET CURRENT
INPUT BIAS CURRENT
VOS
IOS
IB
50
125
0.4
4.0
450 µV
VCM = 0 V
VCM = 0 V
0.4
4.0
5
nA
nA
15
25
LARGE-SIGNAL
VOLTAGE GAIN
VS = 15 V, VO = 10 V
RL = 100 kΩ
AVO
AVO
AVO
700
350
125
1200
600
250
400
200
100
800
400
200
V/mV
V/mV
V/mV
RL= 10 kΩ
RL = 2 kΩ
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kΩ
AVO
AVO
200
100
400
180
100
70
250
140
V/mV
V/mV
RL = 10 kΩ
INPUT VOLTAGE RANGE1
IVR
V+ = 5 V, V– = 0 V
VS = 15 V
0/4
–15/13.5
0/4
–15/13.5
V
V
OUTPUT VOLTAGE SWING VO
VS = 15 V
RL = 10 kΩ
14
11
14.2
12
14
11
14.2
12
V
V
RL = 2 kΩ
VOH
V+ = 5 V, V– = 0 V
RL = 2 kΩ
V+ = 5 V, V– = 0 V
RL = 10 kΩ
4.0
4.2
4.0
4.2
V
VOL
100
500
5.6
100
500 µV
COMMON-MODE
REJECTION
CMR
CMR
V+ = 5 V, V– = 0 V,
0 V < VCM < 4 V
VS = 15 V,
90
110
130
80
90
100
120
dB
dB
–15 V < VCM < 13.5 V
100
POWER SUPPLY
REJECTION RATIO
PSRR
SR
1.0
12
3.2
12
10
µV/V
SLEW RATE
VS = 15 V
5
5
V/ms
SUPPLY CURRENT
ISY
ISY
VS = 1.5 V
VS = 15 V
9
14
15
20
9
14
15
20
µA
µA
CAPACITIVE LOAD
STABILITY2
AV = 1
No Oscillations
250
650
3
250
650
3
pF
INPUT NOISE VOLTAGE
en p-p
fO = 0.1 Hz to 10 Hz
VS = 15 V
µV p-p
MΩ
GΩ
INPUT RESISTANCE
DIFFERENTIAL MODE
RIN
VS = 15 V
VS = 15 V
30
20
30
20
INPUT RESISTANCE
COMMON-MODE
RINCM
NOTES
1Guaranteed by CMR test.
2Guaranteed but not 100% tested.
Specifications subject to change without notice.
–2–
REV. A
OP90
(VS = ؎1.5 V to ؎15 V, –55؇C ꢀ TA ꢀ +125؇C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT OFFSET VOLTAGE
VOS
80
400
µV
AVERAGE INPUT OFFSET
VOLTAGE DRIFT
TCVOS
IOS
0.3
1.5
4.0
2.5
5
µV/°C
nA
INPUT OFFSET CURRENT
INPUT BIAS CURRENT
VCM = 0 V
VCM = 0 V
IB
20
nA
LARGE-SIGNAL
VOLTAGE GAIN
AVO
VS = 15 V, VO = 10 V
RL = 100 kΩ
225
125
50
400
240
110
V/mV
V/mV
V/mV
RL = 10 kΩ
RL = 2 kΩ
AVO
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kΩ
100
50
200
110
V/mV
V/mV
RL = 10 kΩ
*
INPUT VOLTAGE RANGE
IVR
V+ = 5 V, V– = 0 V
VS = 15 V
0/3.5
–15/13 5
V
V
OUTPUT VOLTAGE SWING VO
VS = 15 V
RL = 10 kΩ
13.5
10.5
13.7
11.5
V
V
RL = 2 kΩ
VOH
V+ = 5 V, V– = 0 V
RL = 2 kΩ
V+ = 5 V, V– = 0 V
RL = 10 kΩ
3.9
4.1
V
VOL
100
500
µV
COMMON-MODE
REJECTION
CMR
V+ = 5 V, V– = 0 V,
0 V < VCM < 3.5 V
VS = 15 V,
85
95
105
115
dB
dB
15 V < VCM < 13.5 V
POWER SUPPLY
REJECTION RATIO
PSRR
ISY
3.2
10
µV/V
SUPPLY CURRENT
VS = 1.5 V
VS = 15 V
15
19
25
30
µA
µA
NOTE
*Guaranteed by CMR test.
–3–
REV. A
OP90
(VS = ؎1.5 V to ؎15 V, –25؇C ꢀ TA ꢀ +85؇C for OP90E/F, –40؇C ꢀ TA ꢀ +85؇C for
ELECTRICAL CHARACTERISTICS OP90G, unless otherwise noted.)
OP9OE
Typ Max
OP9OG
Typ Max
Parameter
Symbol Conditions
Min
Min
Unit
INPUT OFFSET VOLTAGE
VOS
70
270
180 675
µV
AVERAGE INPUT OFFSET
VOLTAGE DRIFT
TCVOS
0.3
0.8
4.0
2
1.2
1.3
4.0
5
µV/°C
nA
INPUT OFFSET CURRENT
INPUT BIAS CURRENT
IOS
IB
VCM = 0 V
VCM = 0 V
3
7
15
25
nA
LARGE-SIGNAL
VOLTAGE GAIN
AVO
VS = 15 V, VO = 10 V
RL = 100 kΩ
500
250
100
800
400
200
300
150
75
600
250
125
V/mV
V/mV
V/mV
RL = 10 kΩ
RL = 2 kΩ
AVO
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kΩ
150
75
280
140
80
40
160
90
V/mV
V/mV
RL = 10 kΩ
INPUT VOLTAGE RANGE*
IVR
V+ = 5 V, V– = 0 V
VS = 15 V
0/3.5
–15/13.5
0/3.5
–15/13.5
V
V
OUTPUT VOLTAGE SWING VO
VS = 15 V
RL = 10 kΩ
RL = 2 kΩ
V+ = 5 V, V– = 0 V
RL = 2 kΩ
V+ = 5 V, V– = 0 V
RL = 10 kΩ
13.5
10.5
14
11.8
13.5
10.5
14
11.8
V
V
VOH
3.9
4.1
3.9
4.1
V
VOL
100
500
5.6
100 500
µV
COMMON-MODE
REJECTION
CMR
V+ = 5 V, V– = 0 V,
0 V < VCM < 3.5 V
VS = 15 V,
80
100
120
80
90
100
110
dB
dB
–15 V < VCM < 13.5 V
100
POWER SUPPLY
REJECTION RATIO
PSRR
ISY
10
5.6
17.8
µV/V
SUPPLY CURRENT
VS = 1.5 V
VS = 15 V
13
17
25
30
12
16
25
30
µA
µA
NOTE
*Guaranteed by CMR test.
–4–
REV. A
OP90
ABSOLUTE MAXIMUM RATINGS1
ORDERING GUIDE
Package Options
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Differential Input Voltage . . . . [(V–) – 20 V] to [(V+) + 20 V]
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . [(V–) – 20 V] to [(V+) + 20 V]
TA = 25؇C
VOS Max
(mV)
Operating
Temperature
Range
CERDIP
Plastic
8-Lead
8-Lead
Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
Z Package . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
P Package . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range
OP90A . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
OP90E . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to +85°C
OP90G . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Junction Temperature (TJ) . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering 60 sec) . . . . . . . . . . . . . . 300°C
150
150
450
450
OP90AZ/883*
OP90EZ*
MIL
IND
XIND
XIND
OP90GP
OP90GS
*Not for new design, obsolete April 2002.
2
Package Type
ꢁJA
ꢁJC
Unit
8-Lead Hermetic DIP (Z)
8-Lead Plastic DIP (P)
8-Lead SO (S)
148
103
158
16
43
43
°C/W
°C/W
°C/W
NOTES
1Absolute Maximum Ratings apply to packaged parts, unless otherwise noted.
2ꢁJA is specified for worst-case mounting conditions; i.e., ꢁJA is specified for
device in socket for CerDIP, and P-DIP; ꢁJA is specified for devices soldered to
printed circuit board for SO package.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the OP90 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–5–
OP90–Typical Performance Characteristics
100
80
60
40
20
0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
4.2
4.0
3.8
3.6
3.4
3.2
3.0
V
= ؎15V
V
= ؎15V
S
S
V
= ؎15V
S
–75 –50 –25
0
25
50
75 100 125
–75 –50 –25
0
25
50
75 100 125
–75 –50 –25
0
25
50
75 100 125
TEMPERATURE –
C
TEMPERATURE –
C
TEMPERATURE –
C
TPC 1. Input Offset Voltage
vs. Temperature
TPC 2. Input Offset Current
vs. Temperature
TPC 3. Input Bias Current
vs. Temperature
22
140
120
100
80
600
500
400
300
200
100
0
NO LOAD
V
T
= ؎15V
= 25؇C
R
= 10k⍀
S
L
20
18
16
14
12
10
8
T
T
= 25 C
= 85 C
A
A
R
= 100k⍀
L
0
A
GAIN
45
V
= ؎15V
= ؎1.5V
S
T
= 125 C
A
60
90
V
40
135
180
S
6
20
4
2
0
0.1
–75 –50 –25
0
25
50
75 100 125
1
10
100
1k
10k
100k
0
5
10
15
20
25
30
TEMPERATURE –
C
FREQUENCY – Hz
SINGLE-SUPPLYVOLTAGE –V
TPC 4. Supply Current vs.
Temperature
TPC 5. Open-Loop Gain vs.
Single-Supply Voltage
TPC 6. Open-Loop Gain and
Phase Shift vs. Frequency
60
40
20
0
16
6
V+ = 5V, V– = 0V
= 25؇C
POSITIVE
V
T
= ؎15V
= 25؇C
S
T
A
14
12
10
8
A
5
4
3
2
1
0
NEGATIVE
6
4
T
A
= 25؇C
= ؎15V
2
V
S
–20
0
100
10
100
1k
10k
100k
1k
10k
100k
100
1k
10k
100k
FREQUENCY – Hz
LOAD RESISTANCE –⍀
LOAD RESISTANCE –⍀
TPC 7. Closed-Loop Gain
vs. Frequency
TPC 8. Output Voltage Swing
vs. Load Resistance
TPC 9. Output Voltage Swing
vs. Load Resistance
–6–
REV. A
OP90
120
100
80
140
120
100
80
1000
100
10
T
= 25؇C
V
T
= ؎15V
= 25؇C
V
T
= ؎15V
= 25؇C
A
S
S
A
A
NEGATIVE SUPPLY
POSITIVE SUPPLY
60
40
60
1
0.1
20
40
1
10
100
1k
1
10
100
1k
1
10
100
1k
FREQUENCY – Hz
FREQUENCY – Hz
FREQUENCY – Hz
TPC 10. Power Supply Rejection
vs. Frequency
TPC 11. Common-Mode Rejection
vs. Frequency
TPC 12. Noise Voltage Density
vs. Frequency
100
V
T
= ؎15V
= 25؇C
S
A
10
1
T
V
A
R
C
= 25؇C
= ؎15V
= +1
= 10k⍀
= 500pF
T
V
A
R
C
= 25؇C
= ؎15V
= +1
= 10k⍀
= 500pF
A
A
S
S
V
L
L
V
L
L
0.1
0.1
1
10
100
1k
FREQUENCY – Hz
TPC 13. Current Noise Density
vs. Frequency
TPC 14. Small-Signal Transient
Response
TPC 15. Large-Signal Transient
Response
+18V
APPLICATION INFORMATION
Battery-Powered Applications
The OP90 can be operated on a minimum supply voltage of 1.6 V,
or with dual supplies 0.8 V, and draws only 14 pA of supply
current. In many battery-powered circuits, the OP90 can be
continuously operated for thousands of hours before requiring
battery replacement, reducing equipment down time and
operating cost.
2
3
7
OP90
4
6
–18V
High-performance portable equipment and instruments frequently
use lithium cells because of their long shelf-life, light weight, and
high-energy density relative to older primary cells. Most lithium
cells have a nominal output voltage of 3 V and are noted for a
flat discharge characteristic. The low-supply voltage requirement
of the OP90, combined with the flat discharge characteristic of
the lithium cell, indicates that the OP90 can be operated over
the entire useful life of the cell. Figure 1 shows the typical dis-
charge characteristic of a 1Ah lithium cell powering an OP90
which, in turn, is driving full output swing into a 100 kΩ load.
Figure 2. Burn-In Circuit
–7–
REV. A
OP90
4
3
Single-Supply Output Voltage Range
In single-supply operation, the OP90’s input and output ranges
include ground. This allows true “zero-in, zero-out” operation.
The output stage provides an active pull-down to around 0.8 V
above ground. Below this level, a load resistance of up to 1 MΩ
to ground is required to pull the output down to zero.
2
1
In the region from ground to 0.8 V, the OP90 has voltage gain
equal to the data sheet specification. Output current source
capatibility is maintained over the entire voltage range includ-
ing ground.
0
APPLICATIONS
Battery-Powered Voltage Reference
0
1000 2000 3000 4000 5000 6000 7000
HOURS
The circuit of Figure 6 is a battery-powered voltage reference
that draws only 17 µA of supply current. At this level, two AA
cells can power this reference over 18 months. At an output voltage
of 1.23 V @ 25°C, drift of the reference is only at 5.5 µV/°C over
the industrial temperature range. Load regulation is 85 µV/mA
with line regulation at 120 µV/V.
Figure 3. Lithium Sulphur Dioxide Cell Discharge
Characteristic with OP90 and 100 kΩ Load
Input Voltage Protection
The OP90 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. The high
breakdown of the PNP transistors coupled with the protection
resistors provides a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without dam-
aging the amplifier.
Design of the reference is based on the bandgap technique.
Scaling of resistors R1 and R2 produces unequal currents in Q1
and Q2. The resulting VBE mismatch creates a temperature
proportional voltage across R3 which, in turn, produces a larger
temperature-proportional voltage across R4 and R5. This volt-
age appears at the output added to the VBE of Q1, which has an
opposite temperature coefficient. Adjusting the output to l.23 V
at 25°C produces minimum drift over temperature. Bandgap
references can have start-up problems. With no current in R1
and R2, the OP90 is beyond its positive input range limit and
has an undefined output state. Shorting Pin 5 (an offset adjust
pin) to ground, forces the output high under these conditions
and ensures reliable start-up without significantly degrading the
OP90’s offset drift.
Offset Nulling
The offset null circuit of Figure 4 provides 6 mV of offset adjust-
ment range. A 100 kΩ resistor placed in a series with the wiper
of the offset null potentiometer, as shown in Figure 5, reduces
the offset adjustment range to 400 µV and is recommended for
applications requiring high null resolution. Offset nulling does not
affect TCVOS performance.
TEST CIRCUITS
V+
V+
(2.5VTO 36V)
2
3
7
OP90
5
R2
6
4
C1
1000pF
R1
240k⍀
1.5M⍀
2
3
7
1
V
6
OUT
OP90
(1.23V @ 25؇C)
100k⍀
5
4
V–
Figure 4. Offset Nulling Circuit
MAT-01AH
2
1
7
V+
6
3
5
2
3
7
OP90
5
R3
6
4
68k⍀
R4
130k⍀
1
100k⍀
100k⍀
R5
20k⍀
OUTPUT
ADJUST
V–
Figure 5. High Resolution Offset Nulling Circuit
Figure 6. Battery-Powered Voltage Reference
–8–
REV. A
OP90
Single Op Amp Full-Wave Rectifier
2-WIRE 4 mA TO 20 mA CURRENT TRANSMITTER
Figure 7 shows a full-wave rectifier circuit that provides the
absolute value of input signals up to 2.5 V even though operated
from a single 5 V supply. For negative inputs, the amplifier acts
as a unity-gain inverter. Positive signals force the op amp output
to ground. The 1N914 diode becomes reversed-biased and the
signal passes through R1 and R2 to the output. Since output
impedance is dependent on input polarity, load impedances
cause an asymmetric output. For constant load impedances, this
can be corrected by reducing R2. Varying or heavy loads can be
buffered by a second OP90. Figure 8 shows the output of the
full-wave rectifier with a 4 Vp-p, 10 Hz input signal.
The current transmitter of Figure 9 provides an output of 4 mA
to 20 mA that is linearly proportional to the input voltage.
Linearity of the transmitter exceeds 0.004% and line rejection is
0.0005%/volt.
Biasing for the current transmitter is provided by the REF-02EZ.
The OP90EZ regulates the output current to satisfy the current
summation at the noninverting node:
VIN R5
5V R5
R1
1
R6
IOUT
=
+
R2
For the values shown in Figure 9,
R2
10k⍀
IN
16
100 Ω
IOUT
=
V
+ 4 mA
+5V
giving a full-scale output of 20 mA with a 100 mV input.
Adjustment of R2 will provide an offset trim and adjustment of
R1 will provide a gain trim. These trims do not interact since
the noninverting input of the OP90 is at virtual ground. The
Schottky diode, D1, prevents input voltage spikes from pulling
the noninverting input more than 300 mV below the inverting
input. Without the diode, such spikes could cause phase reversal of
the OP90 and possible latch-up of the transmitter. Compliance of
this circuit is from 10 V to 40 V. The voltage reference output
can provide up to 2 mA for transducer excitation.
R1
2
7
OP90FZ
4
V
IN
1N914
10k⍀
6
V
OUT
3
HP5082-2800
R3
100k⍀
Figure 7. Single Op Amp Full-Wave Rectifier
Figure 8. Output of Full-Wave Rectifier with 4 Vp-p
10 Hz Input
,
+5V
REFERENCE
2mA MAX
6
2
V+
REF-02EZ
4
(10VTO 40V)
R1
1M⍀
2
3
7
OP90EZ
4
6
2N1711
R2
+
5k⍀
D1
R3
4.7k⍀
HP
R4
V
IN
5082-
2800
100k⍀
–
R6
100⍀
R5
I
80k⍀
OUT
R
L
16V
IN
+ 4mA
100⍀
I
=
OUT
Figure 9. 2-Wire 4 mA to 20mA Transmitter
REV. A
–9–
OP90
Micropower Voltage-Controlled Oscillator
tions. Nonlinearity is less than 0.1% for gains of 500 to 1000
over a 2.5 V output range. Resistors R3 and R4 set the voltage
gain and, with the values shown, yield a gain of 1000. Gain
tempco of the instrumentation amplifier is only 50 ppm/°C.
Offset voltage is under 150 µV with drift below 2 µV/°C. The
OP90’s input and output voltage ranges include the negative
rail which allows the instrumentation amplifier to provide true
“zero-in, zero-out” operation.
Two OP90s in combination with an inexpensive quad CMOS
switch comprise the precision VCO of Figure 10. This circuit
provides triangle and square wave outputs and draws only 50 µA
from a single 5 V supply. A1 acts as an integrator; S1 switches
the charging current symmetrically to yield positive and negative
ramps. The integrator is bounded by A2 which acts as a Schmitt
trigger with a precise hysteresis of 1.67 V, set by resistors R5,
R6, and R7, and associated CMOS switches. The resulting output
of A1 is a triangular wave with upper and lower levels of 3.33 V
and 1.67 V. The output of A2 is a square wave with almost
rail-to-rail swing. With the components shown, frequency of
operation is given by the equation:
+5V
0.1F
7
2
3
–IN
6
5
V
OP90EZ
OUT
fOUT =VCONTROL V × 10 Hz /V
( )
R2
500k⍀
GAIN
+IN
1
4
but this is easily changed by varying C1. The circuit operates
well up to a few hundred hertz.
R4
3.9M⍀
ADJUST
R1
4.3M⍀
Micropower Single-Supply Instrumentation Amplifier
R3
1M⍀
The simple instrumentation amplifier of Figure 11 provides over
110 dB of common-mode rejection and draws only 15 µA of
supply current. Feedback is to the trim pins rather than to the
inverting input. This enables a single amplifier to provide differ-
ential to single-ended conversion with excellent common-mode
rejection. Distortion of the instrumentation amplifier is that of a
differential pair, so the circuit is restricted to high gain applica-
Figure 11. Micropower Single-Supply Instrumentation
Amplifier
+5V
C1
+5V
75nF
R5
200k⍀
+5V
R1
2
3
7
200k⍀
6
2
OP90EZ
A1
7
V
CONTROL
R2
6
SQUARE
OUT
OP90EZ
A2
4
3
200k⍀
4
R3
100k⍀
R4
200k⍀
TRIANGLE
OUT
R8
+5V
200k⍀
CD4066
S1
14
1
2
3
IN/OUT
V
+5V
R6
200k⍀
R7
200k⍀
DD
CONT 13
CONT 12
OUT/IN
OUT/IN
S2
4
5
IN/OUT
CONT
IN/OUT 11
OUT/IN 10
S3
S4
OUT/IN
IN/OUT
9
8
6
7
CONT
+5V
V
SS
Figure 10. Micropower Voltage Controlled Oscillator
–10–
REV. A
OP90
Single-Supply Current Monitor
V+
Current monitoring essentially consists of amplifying the voltage
drop across a resistor placed in a series with the current to be
measured. The difficulty is that only small voltage drops can be
tolerated and with low precision op amps this greatly limits the
overall resolution. The single supply current monitor of Figure 12
has a resolution of 10 µA and is capable of monitoring 30 mA of
current. This range can be adjusted by changing the current
sense resistor R1. When measuring total system current, it may
be necessary to include the supply current of the current moni-
tor, which bypasses the current sense resistor, in the final result.
This current can be measured and calibrated (together with the
residual offset) by adjustment of the offset trim potentiometer,
R2. This produces a deliberate offset that is temperature
dependent. However, the supply current of the OP90 is also
proportional to temperature and the two effects tend to track.
Current in R4 and R5, which also bypasses R1, can be accounted
for by a gain trim.
+
TO CIRCUIT
UNDERTEST
3
2
–
7
6
4
V
= 100mV/mA (I
)
OP90EZ
OUT
TEST
I
5
TEST
1
R4
9.9k⍀
R2
100k⍀
R1
1⍀
R5
100⍀
R3
100k⍀
Figure 12. Single-Supply Current Monitor
REV. A
–11–
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Lead Hermetic Package
8-Lead PDIP Package
(Q-8)
(N-8)
0.055 (1.4)
MAX
0.005 (0.13)
0.430 (10.92)
0.348 (8.84)
MIN
8
5
8
5
0.310 (7.87)
0.220 (5.59)
0.280 (7.11)
0.240 (6.10)
PIN 1
1
4
1
4
0.325 (8.25)
0.300 (7.62)
PIN 1
0.100 (2.54) BSC
0.405 (10.29) MAX
0.100 (2.54)
BSC
0.320 (8.13)
0.290 (7.37)
0.060 (1.52)
0.015 (0.38)
0.210
(5.33)
MAX
0.195 (4.95)
0.115 (2.93)
0.060 (1.52)
0.015 (0.38)
0.200 (5.08)
MAX
0.130
(3.30)
MIN
0.160 (4.06)
0.115 (2.93)
0.150
(3.81)
MIN
0.200 (5.08)
0.125 (3.18)
0.015 (0.381)
0.008 (0.204)
0.015 (0.38)
0.008 (0.20)
SEATING
PLANE
0.022 (0.558) 0.070 (1.77)
0.014 (0.356) 0.045 (1.15)
SEATING
PLANE
15°
0°
0.023 (0.58) 0.070 (1.78)
0.014 (0.36) 0.030 (0.76)
8-Lead Soic Package
(R-8)
0.1968 (5.00)
0.1890 (4.80)
8
1
5
4
0.2440 (6.20)
0.2284 (5.80)
0.1574 (4.00)
0.1497 (3.80)
PIN 1
0.0196 (0.50)
؋
45؇ 0.0500 (1.27)
BSC
0.0099 (0.25)
0.102 (2.59)
0.094 (2.39)
0.0098 (0.25)
0.0040 (0.10)
SEATING
PLANE
8؇
0؇ 0.0500 (1.27)
0.0192 (0.49)
0.0138 (0.35)
0.0098 (0.25)
0.0075 (0.19)
0.0160 (0.41)
Revision History
Location
Page
9/01—Data Sheet changed from REV. 0 to REV. A.
Edits to PIN CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3, 4
Edits to ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Edits to PACKAGE TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DELETED OP90 DICE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DELETED WAFER TEST LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
–12–
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